Latest threads in Electronics Designshow only best voted threads
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DS1054 LF common mode aberation
Looking at Low-Frequency noise on a 60Hz power supply, using a Rigol DS1054 and not getting very far. One puzzling issue is, when ch3 or ch4 scope probe grounds are connected to a common 0V reference...
16
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7 years ago
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16 | |
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Stupid Human^H^H Silicon Trick
Haven't seen anything about this before: Makes sense, "hot carrier" charges getting lodged in the oxide. Unclear how reliable it is over long times (more than hours or days), and how consistent the...
1
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7 years ago
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What Am I Going to Do With All This Iron ?
I have these amps, they are fried. Well one is not but it has corroded circ uit boards so I am not even going to try to fix it. But they have some heavy duty transformers and power supplies. What can...
14
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7 years ago
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14 | |
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Power switch is erratic on receiver
I picked up a used Koss HH375 receiver at a Goodwill store. It's purpose is to power some speakers for my computer's sound. Although this is no high powered amplifier, it does the job, and sounds 100...
2
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7 years ago
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2 | |
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How do those Spring Reverbs work in guitar amps?
The Spring Reverbs inside guitar amps have always fascinated me, and I took them one step further by connecting one to my stereo years ago, and the sound was really cool! So, yea, I know the basic...
41
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7 years ago
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41 | |
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Logic circuits in LTSpice
When simulating purely digital circuits in LTSpice (with the exception maybe of pull-up and pull-down resistors, etc.) is it best to use the "standard" solver in the settings, or the "alternate"?
26
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7 years ago
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26 | |
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Lockin' stuff up
Saw a PSA on the tube last night (I don't often watch TV so apologies if this is "old news"). Issue was basically: "lock up your Rx medications so folks living/visiting your home can't help themselves...
25
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7 years ago
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25 | |
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bad, better delay circuits
We want to trim the rising edge times of some pulses. The obvious circuit is a current source + capacitor linear ramp followed by a comparator. The first circuit here was the initial idea, seems...
35
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7 years ago
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35 | |
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Amplifier transistor substitution.
The smoke escaped from my old oscilloscope today. I've determined that it came out of R740, to the bottom right of the circuit diagram. This is because T711 has shorted out. Not very surprisingly I...
20
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7 years ago
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20 | |
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Where's the inductor?
Some relatively-powerful LED light sources, featuring integrated AC offline power supplies, are on eBay and Amazon, with descriptions like, 20W 30W 50W LED Floodlight COB Chip 110V 220V Input...
26
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7 years ago
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26 | |
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Triggering 12V electro lock
Would it be possible to trigger 12V electro lock with 5v relay that is connected directly to raspberry ? So, relay board would be powered from raspberry. GM
9
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7 years ago
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9 | |
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Sendin impuls --> relay --> schematics suggestion
Hi. I need to send one impulse that should simulate button press of some device. I can use 12V power supply for this electronics. The idea was to use 12 relay and NE555 to make this work. So this...
5
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7 years ago
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Couch + high humidity does solve problem.
A while ago I post a story here and other newsgroup about a couche generating static electricity and shocks and so forth. Now that air humidity is high this problem has basically disappeared. I...
8
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7 years ago
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8 | |
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Fail to amplify 27mhz rf using mosfet IRF843
I found old mosfet transistor IRF843, using 20k and 70k resistor, i manage to set the voltage at transistor gate to 3.9 volt and using 1uF to channel the 27mhz rf signal to the transistor gate, i...
20
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7 years ago
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20 | |
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Parasitics?
I'm running a simulation where I'm pumping charge into a capacitor to generate a voltage. A transistor emitter/source is connected to the positive rail and the collector/drain is connected to a 1 nF...
18
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7 years ago
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